So, this may sound a bit strange but I have a question about Dalish bathing habits... For headcanon reasons. 
I'm on the side that they would probably bath separate once reaching puberty...but then again it could depend on the clan. Solas himself talks about how different all of the clans have become,
I kind of wonder how Solas would actually view it. I mean...there is that one little story of the Arlathan noble who wanted to court a woman but he needed to know who she was so he could ask her family for permission or something like that. So, they must have had pretty serious courting traditions in Arlathan? And if so, that wouldn't that mean the sexes bathing together would be pretty 'Whoa, hold on there!"
And on the note of elves courting each other, they probably both feel kinda weird then right? I mean....Lavellan is kind of expecting a pelt or something at some point but Solas isn't Dalish....and Solas may feel like he needs to be asking her family if he can court her but we all know how his meetings with the Dalish have gone. Then again, Solas was probably a rule breaker right? Maybe it's just Lavellan feeling awkward with that.
And if it is the case that they feel like they are in some kind of courtship block thing....maybe Lavellan more so than Solas.
Omg....that makes the waterfall scene even more....Solas even says he has been trying to think of some way to show his care....and that what he can give her is the truth....Lavellan must have been thinking "Yay a 'pelt'! Let's go do it under this beautiful waterfall like real elves!!"
Uhhh......if it's not one sad thing in this love story it's another.
I also think I just answered myself on whether or not my Lavellan and Solas "bumped bits" as Sera so eloquently put it.
*cries*